package com.dingding.common.core.util;

import java.util.Random;

public class RandomNumber {
	
    /** 
     * 随机生成 num位数字字符数组 
     *  
     * @param num 
     * @return 
     */  
    public static Integer generateRandomNumber(int num) {  
    	int[] array = {0,1,2,3,4,5,6,7,8,9};
    	Random rand = new Random();
    	for (int i = 10; i > 1; i--) {
    	    int index = rand.nextInt(i);
    	    int tmp = array[index];
    	    array[index] = array[i - 1];
    	    array[i - 1] = tmp;
    	}
    	int result = 0;
    	for(int i = 0; i < 6; i++)
    	    result = result * 10 + array[i];
    	
    	return result;
    }
    
    public static void main(String[] args) {
		
	}
}
